Oct 31How we could have prevented this Solidity Vulnerability: The DAOWelcome to my series of blogs about common and high-profile vulnerabilities in Solidity smart contracts. In this series, I’ll explain how different vulnerabilities have been exploited in Solidity smart contracts and how choosing languages like Solidity actually sets developers up for difficulty from the beginning. Solidity requires developers to learn…Smart Contracts9 min readSmart Contracts9 min read
May 31How to do Token Transfer Events ProperlyPart 1 in a series about the new Cadence token smart contract standards on the Flow Blockchain Flashback to November 2019. COVID was still relatively unknown, NBA Top Shot was in early development, and a bored ape was simply something that made you a little bit sad when you saw…Smart Contract Blockchain7 min readSmart Contract Blockchain7 min read
May 9My Priorities: May 2023Hello! It is Josh again from the Flow Smart Contract Engineering team. I want to give a brief update about what I’m working on with the community, the Flow Smart Contract Engineering team, and the Protocol team. If this is your first time reading one of my posts, please check…Flow Blockchain5 min readFlow Blockchain5 min read
Oct 25, 2022Here’s what the Flow Smart Contract Team and I are working on for the near futureHello! It is Josh again from the Flow Smart Contract Engineering team. If this is your first time reading one of my posts, please check out earlier ones in the series to get some insight into Cadence development! I’ll be posting more educational blog posts about Cadence soon, so give…Smart Contract Blockchain8 min readSmart Contract Blockchain8 min read
May 4, 2022Some Potentially Huge News for Flow Developers!Hello! It has been a while since I posted last. Almost a year, but not quite! Lots of things have been happening on the Flow team. In case this the first time reading one of my posts, I am a smart contract engineer on the core Flow Blockchain Team. The…Smart Contracts4 min readSmart Contracts4 min read
Jun 24, 2021How do I check msg.sender in Cadence? Capabilities!Hello! My name is Josh Hannan and I am a smart contract engineer on the Flow Team at Dapper Labs. It has a been a while since I posted last. It has been a busy time for the Flow team. Things have been going fast here on the Flow team…Smart Contracts4 min readSmart Contracts4 min read
Apr 22, 2021Optionals in Cadence? Not Optional!Hello everyone! Welcome to my bi-weekly blog about Cadence, the new smart contract programming language for the Flow Blockchain. If you are a newcomer, check out my introductory blog post to get started! Today, I’m going to talk about an aspect of Cadence that many people have a lot of…Smart Contracts8 min readSmart Contracts8 min read
Apr 8, 2021How I organize my Cadence projectsWelcome back to my Cadence blog! Josh here! I’m a smart contract engineer on the Flow team at Dapper Labs and I’m putting out short bi-weekly blogs about our programming language, Cadence. If you’re new to Cadence, please check out my introductory blog to get started! Taking your First Steps with Cadence A summary of resources each newcomer to Flow should complete to get comfortable writing smart contracts in Cadence.joshuahannan.medium.comBlockchain6 min readBlockchain6 min read
Mar 25, 2021Creating a token on the Flow blockchain? Don’t forget this VITAL part!Disclaimer: Do not be alarmed by the title and thumbnail. Nothing has gone wrong, I just want people who are writing smart contracts to make sure they understand this very important part of token smart contracts. Welcome to my Cadence blog! I’m Josh, a smart contract developer on the Flow…Smart Contracts6 min readSmart Contracts6 min read
Mar 12, 2021What I’ve learned in the year since I wrote the NBA Top Shot smart contractsHello! My name is Josh, and I write smart contracts at Dapper Labs for the Flow blockchain. If you’re new here, welcome! This is my bi-weekly blog about Cadence, Flow’s new state-of-the-art language for smart contracts. I recommend starting out with my first post about beginner materials before reading this…Blockchain11 min readBlockchain11 min read
